Continental Crust Versus Oceanic Crust: Key Differences And Characteristics

The video tutorial explains the differences between continental and oceanic crusts, focusing on their thickness, composition, density, and origin. It highlights the role of silicates in determining crust properties and discusses the formation of continents through oceanic plate collisions. The concept of seafloor spreading and its implications for the future of Africa, particularly the East African Rift Valley, is also covered.

What is the primary reason for attending the full session on continental and oceanic crusts?

• To get a certificate

• To understand the differences between crusts

• To study marine life

• To learn about ocean currents

Which crust is generally thicker?

• Continental crust

• Depends on the location

• Oceanic crust

• Both are the same

What is the average thickness of the continental crust?

• 100 km

• 5-10 km

• 35-100 km

• 70 km

Which rock type is primarily found in the continental crust?

• Limestone

• Sandstone

• Granite

• Basalt

What is the main rock type found in oceanic crust?

• Gneiss

• Granite

• Andesite

• Basalt

Why is the continental crust considered lighter?

• It is closer to the surface

• It has a lower density

• It is made of basalt

• It is thinner

What is the density of basaltic rocks in the oceanic crust?

• 2.8 grams per cm³

• 3 grams per cm³

• 3.3 grams per cm³

• 4 grams per cm³

What process is responsible for the formation of island arcs?

• Earthquake activity

• Seafloor spreading

• OO collision

• Volcanic eruption

How does the oceanic crust primarily form?

• By seafloor spreading

• Through erosion

• By sediment deposition

• Through volcanic eruptions

What is the future geological prediction for the East African Rift Valley?

• It will remain unchanged

• It will become a mountain range

• It will form a new ocean

• It will merge with the Sahara Desert